mountains = ["Taishan Mountain", "Songshan Mountain",
             "Huashan Mountain", "Huangshan Mountain"]
rivers = ["Yellow River", "Yangtze River", "Songhua River", 'Yalu River']
countries = ['America', 'China', 'Japan', 'Britain', 'France', 'Germany']
cities = ['Shanghai', 'Wuhan', 'Guangzhou', 'New York', 'Washington',
          'Tokyo', 'London', 'Paris', 'Berlin']
languages = ['English', 'Chinese', 'Japanese', 'French', 'German']
print(mountains)
sorted(mountains)
print(mountains)
mountains.sort()
print(mountains)
mountains.reverse()
print(mountains)
print(len(mountains))

